Common Units Not Officially Sanctioned
| Name | Symbol | Quantity | Equivalent SI unit |
|---|---|---|---|
| ångström, angstrom | Å | length | 1 Å = 0.1 nm = 10−10 m |
| are | a | area | 1 a = 1 dam2 = 100 m2 |
| barn | b | area | 1 b = 10−28 m2 |
| bar | bar | pressure | 1 bar = 105 Pa |
| millibar | mbar | pressure | 1 mbar = 1 hPa = 100 Pa |
| atmosphere | atm | pressure | 1 atm = 1013.25 mbar = 1013.25 hPa = 101,325 Pa exactly (commonly used in atmospheric meteorology, in oceanography and for pressures within liquids, or in the industry for pressures within containers of liquefied gas) |
| dyne per square centimetre (barye) | Ba | pressure | 1 Ba = 0.1 Pa = 0.1 N/m2 = 100 g·cm−1·s−2 |
| millimetre of mercury | mmHg | pressure | 1 mmHg = 133.322387415 Pa at 0 °C = 133.322387415 N/m2 at 0 °C = 133.322387415 kg·cm−1·s−2 at 0 °C |
| torr | Torr | pressure | 1 Torr = 1/760 atm = 133.322368421... Pa = 133.322368421... N/m2 = 133.322368421... kg·cm−1·s−2 |
Read more about this topic: Non-SI Units Mentioned In The SI
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